Sintering apparatus



NOV. 26, 1929. ELLIS I 1,737,007

SINTERINC; APPARATUS Filed May 5, 1928 He ed Hap 6F 770 b=l v H INVENTOR EDW/A/EELL/S A T ORNE Y Patented Nov. 26, 1929 PATENT. OFFICE EDWIN E. ELLIS, OF SHORT HILLS, NEW JERSEY SINTERING APBARATUS Application filed May 5, 1928. Serial No. 275,380.

This invention relates to sintering apparatus and aims to provide for the prolonging of the useful life of grates on which the charge is sintered. In a recently developed sintering process, the proposal has been made to treat ore by passing a blast containing chlorine through the charge. The fumes or gases liberated vigorously attack the metal grates of the sintering apparatus and in a short time the same are destroyed or rendered unfit for further use. These grates are usually made of cast iron or steel which is readily attacked by the corrosive gases of the sintering operation. Of course, a resistant metal containing chromium might have a longer life than ordinary steel or cast iron but sintering apparatus made of such chromium containing metal will add greatly to the initial cost of the apparatus and it, too, may be slowly destroyed by the gases liberated in the sintering operation.

' According to my invention, I propose to cover the grate of the sintering apparatus with a coating which can be applied as the apparatus is used, this coating being adapted to resist the destructive action due to chemical reaction of the gases and vapors liberated in the sintering operation. A suitable protective coating may consist of lime in the form of burnt limestone or dolomite. Or, I may use, clay or sodium silicate. These materials may be appliedeither by a brush or by means of a spray or bath.

. The accompanying drawings diagrammatically illustrate the application of the invention wherein- Fig. 1 is a longitudinal section exemplifying one type of apparatus;

Fig. 2 is an enlarged section through one of the grate bars of the apparatus shown in Fig. 1.

In the drawings, 10 represents the frame of a conventional form of sintering appatective material is applied thereto in the form of a slurry or as a semi-liquid or plastic mass.

The drawings show a simple ipe 22 by means of which the coating may e sprayed on one side of the grate bars, and a rota brush 24 mounted in a trough 26 by means of which the coating is applied to the other side of the grate bars. The pipe 22 and the trough 26 are connected to a supply tank 28 containing a slurry of milk of lime, clay,sodium silicate or material suitable for the purpose.

The coating may also be applied manually by a brush or trowel, or, the grates may be passed through a bath of coating material.

Fig. 2 illustrates a conventional grate bar 14 of the sintering apparatus after the same has been coated with a layer 25 of lime or similar protective coating adapted to resist corrosive action of the fumes or gases liberated in the sintering treatment.

Various modifications may be made with-' out departing from the invention as defined in the appended claims.

What I claim is 1. In sintering ap aratus, travelling grate members and means or applying a protective coating thereto to resist the destructive action of gases liberated in the sinterin operation.

2. The method of sintering w ich includes the step of applying a protective coating to the part of the apparatus by which the charge is carried.

3. The method of sintering which includes my name.

EDWIN E. ELLIS.

ratus including a travelling grate 12 consisting of a plurality of grate members 14 carried by a chain guided on supporting sprocket members 16 and 18. The charge 20 to be sintered is carried by the upper series of grate bars 14 and after these bars have discharged their load and travelled around to a location in the zone of the device 22, a coating of pro- 

